To jnosol - I did exactly the same thing you did - replaced front Dunlops with worn out outers with Continental DWS. Love the tires, but get this - BMW dealer wouldn't do the swap - mumbling something about going from RFT to non RFT, liability, blah blah.

Tell them to call Baron BMW in Shawnee Mission, KS. They were glad to do it for $100 (after tax and disposal), all 4 tires. I kept my 2 good rear ones and selling them for $200/pair.

There's no liability if the customer understood the new tires do not run without air.